y^2 + 4 Y - 21 factorise
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Answered by
2
Answer:
y² + 4y - 21
y² + (7 - 3)y - 21
y² + 7y - 3y - 21
y(y+7) - 3(y+7)
(y+7) (y - 3)
Step-by-step explanation:
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Answered by
1
Answer:
Step-by-step explanation:
Product = -21 and Sum=+4, therefore factors = +7 and -3
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