Question

stiind ca 5a+2b=10 si 25a²-4b²=70 calculati 2b-5a
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Answer 1

Răspuns:

$2b-5a=-7$

Explicație pas cu pas:

$\\(a-b)(a+b)=a^2-b^2\\\\25a^2-4b^2=70\\(5a-2b)(5a+2b)=70\\5a-2b=\frac{70}{10} =7\\2b-5a=-7$