(2x + 4)(2x - 4)
to check your answer, use the FOIL method
(first, outside, inside, last)
F.... 2x x 2x = 4x^2
0.... 2x x -4 = -8x
I..... 2x x 4 = 8x
L.... 4 x -4 = -16
so 4x^2 - 16 = (2x + 4)(2x - 4)
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-17
20x2 - 27x -8 20 * -8 is -160, and -32 and 5 add to -27 20x2 - 32x + 5x - 8 4x(5x-8) + 1(5x-8) (4x + 1)(5x-8)
3 squared = 9 4 squared = 16 9 x 16 = 144 3 squared x 4 squared = 144
4x+9=25 4x+9=25-9 4x/4=1 16/4=4 4x+9=26 4(4)+9=25 16+9=25 The answer is 4
Solve for Y algebraically. 4X + 8Y = 16 8Y = - 4X + 16 Y = - 1/2X + 2 graph and see that the Y intercept = 2