Question

Expand using formula (4a+5b-7)(4a+5b+2)

Answer 1

Step-by-step explanation:

4a(4a+5b+2)+5b(4a+5b+2)-7(4a+5b+2)

= 16a^2+20ab+8a+20ab+25b^2+10b-28a-35b-14

= 16a^2+25b^2-20a-25b+40ab-14

Hope this helps

MARK AS BRAINLIEST

Answer 2

Answer:

Let, 4a + 5b = x

( 4a + 5b - 7 ) ( 4a + 5b + 2 )

=> ( x - 7 ) ( x + 2 )

=> x² - ( 2 - 7 ) x - 14

=> x² - 5x - 14

=> ( 4a + 5b ) -5 ( 4a + 5b ) - 14

=> 16a² + 40ab + 25b² - 20a - 25b - 14

Hope it helps!!!

Thank you so much...