It is 12r - 20 or 4*(3r - 5)
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The expression is: 12r-20 when simplified
To answer a quadratic like this, st everything equal to zero. 5r^2+12r=-4r^2-4 9r^2+12r+4=0 Ask yourself what two numbers add to get 12 that multiply to get 9*4=36 1*36 no 2*18 no 3*12 no 4*9 no 6*6 yes (3r+2)(3r+2) The first and last multiply to get 6 and the outside and inside multiply to get 6. That's (3r+)^2
12
8 x 12 = 96
x - 8 = 12 x - 8 + 8 = 12 + 8 x = 20