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dusya [7]
3 years ago
5

Solve the quadratic. x^2+8x+3=0

Mathematics
2 answers:
Reil [10]3 years ago
6 0
Factor
find wht 2 numbers add to 8 and multiply to 3
none do

use quadratic formula which can be used when
ax^2+bx+c=0
x=\frac{-b+/- \sqrt{b^{2}}-4ac }{2a}

a=1
b=8
c=3

x=\frac{-8+/- \sqrt{8^{2}-4(1)(3)} }{2(1)}
x=\frac{ -8+/- \sqrt{64-12} }{2}
x=\frac{ -8+/- \sqrt{52} }{2}
x=\frac{ -8+/- 2 \sqrt{13} }{2}
x=-4+/- \sqrt{13}

x=-4+ \sqrt{13} or x=-4- \sqrt{13}
aprox x=-7.60555 or x=-0.394449





babunello [35]3 years ago
4 0

Use quadratic formula with a=1, b=8, c=3.

<span>x=<span><span><span>−b</span>±<span>√<span><span>b2</span>−<span><span>4a</span>c</span></span></span></span><span>2a</span></span></span><span>x=<span><span><span>−<span>(8)</span></span>±<span>√<span><span><span>(8)</span>2</span>−<span><span>4<span>(1)</span></span><span>(3)</span></span></span></span></span><span>2<span>(1)</span></span></span></span><span>x=<span><span><span>−8</span>±<span>√52</span></span>2</span></span><span><span>x=<span><span>−4</span>+<span><span><span><span><span>√13</span>‌</span>‌ or </span>‌</span>‌x</span></span></span>=<span><span>−4</span>−<span>√13</span></span></span>Answer:<span><span>x=<span><span>−4</span>+<span><span><span><span><span>√13</span>‌</span>‌ or </span>‌</span>‌x</span></span></span>=<span><span>−4</span>−<span>√13</span></span></span><span><span><span>
</span></span></span><span><span><span>I hope that's help ! </span></span></span>


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