Question

7. If A = a² + 2ab + b2 and B = – 2a? – 7ab – 6b2, find the value of A + B.
8. If M = xº + 2x² + 5xy + 9 and N = 3x2 + 4x² + 6xy + 18, find the value of (N - M).​

Answer 1

Step-by-step explanation:

(1) a^2 +2ab+b^2+(-2ab - 7ab-6b^2)

a^2 +2ab+b^2-2ab-7ab-6b^2

a^2 +2ab-2ab - 7ab +b^2-6b^2

a^2-7ab-5b^2

(8) 6+4x^2+6xy-(1+2x^2+5xy+9)

6+4x^2+6xy-1-2x^2-5xy-9

6-1-9+4x^2-2x^2+6xy-5xy

-4+2x^2 +xy