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What is the answer to 3x^2 +30x+75

User Gongarek
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1 Answer

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The answer is 3(x+5)^2

Factor out 3 from the original equation

3(x^2+10x+25)

Then find two numbers that multiply to give 25 and add to give 10. The two numbers are 5 and 5

This gives...
3(x^2+5x+5x+25)

Factorise the expression in the brackets

3(x+5)(x+5)

Combine like terms

3(x+5)^2
User Lukaszgard
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