Answer:

2. 5b³-20b²+10b

solution:

(5b) (b²-4b+2)

= (5b)(b²) - (5b)(-4b) + (5b)(2)

= 5b³+20b²+10b

3. -12m³-18m²

solution:

(-3m²)(4m-6)

= (-3m²)(4m)-(-3m²)(-6)

= -12m³-18m²

4. -4x³-2x²-8x

solution:

(-2x)(2x²+x-4)

= (-2x)(2x²) + (-2x)(x) - (-2x)(-4)

= -4x³ - 2x²-8x

Explanation:

remember the product rule when multiplying exponents

exponent × exponent = exponent + exponent

in multiplying and dividing integers

• like sign , positive
• unlike sign, negative

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