(x+5)2+(x-10)=2X2помогите!!!!!!!!!!!!!!!!!!!

Question

(x+5)2+(x-10)=2X2
помогите!!!!!!!!!!!!!!!!!!!

Answer 1

(x+5)^2+(x-10)=2x^2
x^2+10x+25+x-10=2x^2
-x^2+11x+15=0
x^2-11x-15=0
д=121+4*15=181
x1.2=(11 -+ √181) / 2
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Comments

не павильно

Answer 2

(x+5)^2+(x-10)=2x^2
x^2+10x+25+x-10=2x^2

-x2 + 10x + 35 = 0
D = b2 - 4ac = 102 - 4·(-1)·35 = 100 + 140 = 240
x1=-10 - √240/2·(-1) ≈ 12.7
x2=-10 +√240/2·(-1) ≈  -2.74