Question

(a-1) do kwadratu+ (a+4) do kwadratu=2a(a-1)-7
(5+x)*(x-5)+4x=x do kwadratu - 5

Answer 1

(a-1)²+(a+4)²=2a(a-1)-7
a²-2a+1+a²+8a+16=2a²-2a-7
2a²+6a-2a²+2a= -7-17
8a= -24/:8
a= -3
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(5+x)(x-5)+4x=x²-5
(x+5)(x-5)+4x=x²-5
x²-25+4x-x²= -5
4x=25-5
4x=20/:4
x=5