Question

solve the following quadratic equations using quadratic formula: 21 + x = 2x^2​

Answer 1

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→21 + x = 2x^2=0

→2x^2-X -21=0

→2x^2 - 7x + 6x - 21=0

→ x • (2x-7) + 3 • (2x-7)=0

→(x+3) • (2x-7)=0

...

..

→ either. / →or. →2x-7=0

→X+3=0. →2x=7

→X=-3. →X=7/2