Question

If a=2 b=-2 x=2 find the value of: (i) a^(2)+b^(2) (iii) a^(2)-b^(2) (ii) a^(2)+ab+b^(2) (iv) x+7+4(x-5) (v) 3(x+2)+5x-7​

Answer 1

Answer:- I hope it’s helpful

Given:- a=2, b-2,x=2

1) a^2+b^2
= 2^2 + (-2)^2
=4+4
=8

2) a^2+ab+b^2
= 2^2+ (2)(-2) + (-2)^2
=4+(-4)+4
=4

3) a^2 - b^2
= 2^2 - (-2)^2
= 4-4
=0

4) x+7+4(x-5)
=x+7+4x-20
=2+7+4(2)-20
= 17-20= -3

5) 3(x+2)+5x-7
= 3(2+2) +5(2)-7
=3(4)+10-7
=12+3
=15