Question

POR FAVOR ME AJUDEM ​

Answer 1

Resposta:

Explicação passo a passo:

Resolvendo:

I.

$10x^{2} +72x-64=0\\\\delta=b^{2} -4ac\\delta=72^{2} -4\:.\:10\:.\:(-64)\\delta=5184-40\:.\:(-64)\\delta=5184+2560\\delta=7744$

II.

$x^{2} -10x+25=0\\\\delta=b^{2} -4ac\\delta=(-10)^{2} -4\:.\:1\:.\:25\\delta=100-100\\delta=0$

III.

$5x^{2} -3x-2=0\\\\delta=b^{2} -4ac\\delta=(-3)^{2} -4\:.\:5\:.\:(-2)\\delta=9-20\:.\:(-2)\\delta=9+40\\delta=49$

IV.

$x^{2} -x-20=0\\\\delta=b^{2} -4ac\\delta=(-1)^{2} -4\:.\:1\:.|:(-20)\\delta=1+80\\delta=81$

Espero ter ajudado!

Desculpe qualquer erro.