Question

Multiply the following algebraic expressions
j)-2(5ab+4)(2b-a) =​

Answer 1

Step-by-step explanation:

-3(5ab+4)(2b-a)

-3(10ab²-5a²b+8b-4a)

-30ab²+15a²b-24b+12a

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Answer 2

$2(5ab + 4)(2b - a)$

$= > ( \blue{2(5ab+ 4)})( \green{ 2b }+ \green{ - a})$

$= > ( \blue{2(5ab + 4)})( \green{ 2b})+ ( \blue{2(5ab+ 4)})( \green{ - a})$

$= > {20ab}^{2} + 16b - 10 {a}^{2} b- 8a$

$= > - 10 {a}^{2} + 20a {b}^{2} - 8a+ 16b$