4r\Xb2+20r+25?, X\Xb2+5x-6, 2x\Xb2+3x-4, 9+\Xb2-2

4r²+20r+25?
x²+5x-6
2x²+3x-4
9+²-2

Answer:

1.16r+20+25

16r=45

r=45/16

2.x+5x-6

6x=-6

x=-1

3.4x+3x-4

7x=-4

x=-4/7

4.81-2=79


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