Question

Multiply: 4a+5b and 4a-5b

Answer 1

fi

use formula

$(x + y)(x - y) = {x}^{2} - {y}^{2}$

therefore

$(4a +5b) \times (4a - 5b) = {(4a)}^{2} - {(5b)}^{2}$

$= 16 {a}^{2} - 25 {b}^{2}$

final answer

Answer 2

Answer:

use Identity a sq. -b sq.

Step-by-step explanation:

4a sq. - 5b sq.

16a - 25b

-9ab

Hence, -9ab is the Solution of this question.

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