Expand (x+4)(x+3).
To answer this you multiply everything in the left bracket by everything in the right bracket, so rewrite the equation as x(x+3)+4(x+3). Then you can expand each more easily:
x(x+3) = x2+3x
4(x+3) = 4x+4×3 = 4x+12
Then add the answers and collect like terms:
x2+3x+4x+12 = x2+7x+12
ED
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