Question

Multiply the binomials:

(y+7)•(y+3)

Answer 1

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`(y+7).(y+3)\\\\y(y+3)+7(y+3)\\\\y^2+3y+7y+21\\\\\pmb{\red{\boxed{y^2+10y+21}}}`

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Answer 2

y^2 +10y+21

Explanation:

(y+7)•(y+3)

FOIL

first: y*y = y^2

outer: 3*y = 3y

inner 7*y = 7y

last 7*3 =21

Add together

y^2 +3y +7y +21

Combine like terms

y^2 +10y+21