Question

multiply: 4a,5ab,7a ​

Answer 1

Answer:

Step by Step Solution

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STEP

1

:

Equation at the end of step 1

((22a2 • b) - 5ab) - 7b

STEP

2

:

STEP

3

:

Pulling out like terms

3.1 Pull out like factors :

4a2b - 5ab - 7b = b • (4a2 - 5a - 7)

Trying to factor by splitting the middle term

3.2 Factoring 4a2 - 5a - 7

The first term is, 4a2 its coefficient is 4 .

The middle term is, -5a its coefficient is -5 .

The last term, "the constant", is -7

Step-1 : Multiply the coefficient of the first term by the constant 4 • -7 = -28

Step-2 : Find two factors of -28 whose sum equals the coefficient of the middle term, which is -5 .

Answer 2

Answer:

140a³

Step-by-step explanation:

= 4a x 5ab x 7a

= 20a²b x 7a

= 140a³