SOLUTION: Solve using quadratic formula 0.7x^2 = 4.2x + 0.7

Question 717930: Solve using quadratic formula
0.7x^2 = 4.2x + 0.7
Answer by jsmallt9(3758) (Show Source): You can put this solution on YOUR website!

Although it's not required, I prefer to eliminate fractions and decimals (if it's not too hard). With this equation all we have to do is multiply each side by 10:

Before we use the Quadratic Formula, we have to put the equation into standard form, . Subtracting the entire right side we get:

Now we can use the formula:

Simplifying...

which is short for:
or

P.S. You should get exactly the same answers if you don't bother eliminating the decimals.
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