Find the

Find the number x, which if it increases by 2, then its square increases by 21 percent.

Correct result:

x =  20
y =  -0.9524

Solution:

q=21%=1+21100=1.21  (x+2)2=x2q  (x+2)2=x2 1.21 0.21x2+4x+4=0 0.21x24x4=0  a=0.21;b=4;c=4 D=b24ac=4240.21(4)=19.36 D>0  x1,2=b±D2a=4±19.360.42 x1,2=9.52380952±10.4761904762 x1=20 x2=0.952380952381   Factored form of the equation:  0.21(x20)(x+0.952380952381)=0  x=x1=20

Our quadratic equation calculator calculates it.

y=x2=(0.9524)=2021=0.9524



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