Find the value

Find the value 
If a=7 ,b=4, c=3,x=5 and y=2 find the value of

(i) 5bc
     5 x b x c
    = 5 x 4 x 3
    = 60

(ii) 3a +4x
   = 3 x a + 4 x x
  = 3 x 7 + 4 x 5
 = 21 + 20
 = 41

(iii) 4c - 3y
      4 x c - 3 x y
=   4 x 3 - 3 x 2
=  12 - 6
=  6.

(iv) 2a -3b + 4y
= 2 x a - 3 x b + 4 x y
= 2 x 7 - 3 x 4 + 4 x 2
= 14 - 12 + 8
= 2 + 8
= 10.

Comments

Post a Comment

Popular posts from this blog

Index Notation.

Image
42 =2×3×7 here 2,3,7 are factors of the product 42. 45=3×3×5 here 3,3,5 are factors of the product 45. Similarly in ab ,a and b are the factors of ab. In 7xy, 7,x,y are factors of 7xy.   Thus ,when numbers or letters standing for numbers are multiplied together to form a product ,each of them is called a factor of that product.   When the same factor is repeated in a product we use a different mode of writing the product.         and a×a×a=       is called the fourth power of a and we say it as a to the fourth power.     2 is called as the index or exponent of the power.   Note: If index is unity it is omitted. Thus a stands for     They all have same meaning   a , 1a, a .
Read more

PROBLEMS AND EQUATIONS.

PROBLEMS AND EQUATIONS     A has five times as many rupees as B and Rs.7 More.If A has in all Rs 67,how many rupees has B. Rs. 5 x + Rs 7 = Rs 67 5 x + 7   = 67 This algebraical statement of the equality of two expressions is called an equation.The expression on the left hand side of the sign of equality is called the left –hand- side ( L.H.S.) of the equation while the expression on the right hand side of the sign of equality is called the right –hand-side (R.H.S) of the equation. In an equation the unknown number is denoted by a letter. The process of finding out the value of this letter so found is called the root of the equation.   Let solve 5 x+ 7= 67 5 x= 67-7 5 x= 60 X=60 / 5 X= 12 Thus B has Rs 12. The solution of an equation is mainly based on following four rules 1.If equals be added to equals , the sums are equal. 2.If equals be subtracted from equals ,the remainders are equal. 3.If equals be multiplied by equals, th...
Read more

Express using symbols

Express using symbols 1. y subtracted from x x-y 2.5 multiplied by k 5 k 3.n added to m m + n 4. a divided by 3 a/3 5. p multiplied by r pr 6. x divided by a x/a 7.Thee sum of a,m and x a+ x+m 8. The product of a, b, x a b x 9 The difference between 8 and 5 is 3 8-5=3 10.The sum of 8 and 3 is equal to the sum of 5 and 6 8 + 3 = 5 + 6
Read more