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a2+64=100.a
We move all terms to the left:
a2+64-(100.a)=0
We add all the numbers together, and all the variables
a2-(+100.a)+64=0
We add all the numbers together, and all the variables
a^2-(+100.a)+64=0
We get rid of parentheses
a^2-100.a+64=0
We add all the numbers together, and all the variables
a^2-100a+64=0
a = 1; b = -100; c = +64;
Δ = b2-4ac
Δ = -1002-4·1·64
Δ = 9744
The delta value is higher than zero, so the equation has two solutions
We use following formulas to calculate our solutions:$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}$$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}$
The end solution:
$\sqrt{\Delta}=\sqrt{9744}=\sqrt{16*609}=\sqrt{16}*\sqrt{609}=4\sqrt{609}$$a_{1}=\frac{-b-\sqrt{\Delta}}{2a}=\frac{-(-100)-4\sqrt{609}}{2*1}=\frac{100-4\sqrt{609}}{2} $$a_{2}=\frac{-b+\sqrt{\Delta}}{2a}=\frac{-(-100)+4\sqrt{609}}{2*1}=\frac{100+4\sqrt{609}}{2} $
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