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Apply the formula: $ax^2+bx+c=0$$\to x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}$, where $a=7$, $x^2a=7x^2$, $b=21$, $x^2a+bx=0=7x^2+21x-28=0$, $c=-28$, $bx=21x$ and $x^2a+bx=7x^2+21x-28$
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$x=\frac{-21\pm \sqrt{21^2-4\cdot 7\cdot -28}}{2\cdot 7}$
Learn how to solve equations quadratiques problems step by step online. Solve the quadratic equation 7x^2+21x+-28=0. Apply the formula: ax^2+bx+c=0\to x=\frac{-b\pm \sqrt{b^2-4ac}}{2a}, where a=7, x^2a=7x^2, b=21, x^2a+bx=0=7x^2+21x-28=0, c=-28, bx=21x and x^2a+bx=7x^2+21x-28. Apply the formula: a=b\to a=b, where a=x and b=\frac{-21\pm \sqrt{21^2-4\cdot 7\cdot -28}}{2\cdot 7}. Apply the formula: x=\frac{b\pm c}{f}\to x=\frac{b+c}{f},\:x=\frac{b-c}{f}, where b=-21, c=35 and f=14. Apply the formula: a+b=a+b, where a=35, b=-21 and a+b=-21+35.
