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5(x2+3=35)
We move all terms to the left:
5(x2+3-(35))=0
We add all the numbers together, and all the variables
5(+x^2+3-35)=0
We multiply parentheses
5x^2+15-175=0
We add all the numbers together, and all the variables
5x^2-160=0
a = 5; b = 0; c = -160;
Δ = b2-4ac
Δ = 02-4·5·(-160)
Δ = 3200
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{3200}=\sqrt{1600*2}=\sqrt{1600}*\sqrt{2}=40\sqrt{2}$$x_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(0)-40\sqrt{2}}{2*5}=\frac{0-40\sqrt{2}}{10} =-\frac{40\sqrt{2}}{10} =-4\sqrt{2} $$x_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(0)+40\sqrt{2}}{2*5}=\frac{0+40\sqrt{2}}{10} =\frac{40\sqrt{2}}{10} =4\sqrt{2} $
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