(x+7)(x+5)=8? Can You Know The X?
Answer:
(x+7)(x+5)=8
x*x + x*5 + x*7 + 7*5 = 8
x2 + 5x + 7x + 35 = 8
x2 + 11x + 35 = 8
x2 + 11x + 35 - 8 = 0
x2 + 11x + 27 = 0
This is the equation which you can derive from the above term but it cannot be solved for the value of x.
Comment: It is a quadratic equation that can be solved for x. (First of all, you correct the math error so it is x^2+12x+27=0)
It factor as (x+3)(x+9)=0. The solutions are x = -3 or x = -9.
Answer: You use the F O I L method (first outside inside last)
But you can not completely solve the equation because you do not have the value of x...
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