Question

Como faço isso sem a fórmula de Baskara? Urgente!

Answer 1

Explicação passo-a-passo:

a)

$x^{2} =81\\\\x=\pm\sqrt{81}\\\\x=\pm9\\\\\boxed{\boxed{S=\{-9,9\}}}$

b)

$x^{2} =225\\\\x=\pm\sqrt{225}\\\\x=\pm15\\\\\boxed{\boxed{S=\{-15,15\}}}$

c)

$2x^{2} =98\\\\x^{2} =\dfrac{98}{2} \\\\x^{2} =49\\\\x=\pm\sqrt{49}\\\\x=\pm7\\\\\boxed{\boxed{S=\{-7,7\}}}$

d)

$3x^{2} =48\\\\x^{2} =\dfrac{48}{3} \\\\x^{2}=16\\\\x=\pm\sqrt{16}\\\\x=\pm4\\\\\boxed{\boxed{S=\{-4,4\}}}$

e)

$6x^{2} -24=0\\\\6x^{2} =24\\\\x^{2} =\dfrac{24}{6}\\\\x^{2} =4\\\\x=\pm\sqrt{4}\\\\x=\pm2\\\\\boxed{\boxed{S=\{-2,2\}}}$