Question

iv)
(4a + 5b) (4a + 7b) - (3a + 4b) (3a + 6b)​

Answer 1

Answer:

=(4a+5b)(4a+7b) - (3a + 4b) (3a +6b)

=(16a^2+28ab+20ab+35b^2) - (9a^2+18ab+12ab+24b^2)

=(16a^2 +48ab +35b^2) - (9a^2 +30ab+24b^2)

=16a^2 + 48ab +35b^2 -9a^2 - 30ab - 24b^2

=7a^2 +18ab -11b^2

Answer 2

Answer:

(16a2 +28ab+20ab+35b2) -(9a2+18ab+12ab+24b2)

Step-by-step explanation:

(16a2+48ab+35b2) - (9a2+ 30ab+24b2) 16a2-9a2+48ab-30ab+ 35b2-24b2

(7a2+18ab+18b2)

I hope you get some understanding about this question