If you mean (4x+7)(7x+6) then it is 28x^2 +24x+49x+42 using the FOIL method
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x2 + 4x - 60 factors into (x + 10)(x - 6). You can use the FOIL method to check your answers when you factor.
Yes.
4x + 3 cannot equal 4x + 12:4x + 3 = 4x + 12 (given)3 = 12 (subtract 4x from both sides)
8x + 15
It is an algebraic expression in the form of: 4x+32