Simplify 7y(y2 + 2y - 3) - 3y(y + 6) and find its value for y = -1.
plz solve with full steps
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Step-by-step explanation:
7y(y2 + 2y - 3) - 3y(y + 6)
=7y^3+14y^2-21y-3y^2-18y
=7y^3+11y^2-39y
substituting y= -1
7y(y2 + 2y - 3) - 3y(y + 6)=7(-1)^3+11(-1)^2-39(-1)
= -7+11+39
= 43
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