Question

Please help, thank you

Answer 1

`\displaystyle x=(-8\pm√((8)^2-4(4)(-221)))/(2(4))\ \text{; x = 6.5 and x = -8.5}`

Explanation:

Subtract the right side of the given equation to put it into standard form:

4x² +8x -221 = 0

Then the coefficients used in the quadratic formula are ...

• a = 4
• b = 8
• c = -221

When these are filled into the form ...

`\displaystyle x=(-b\pm√(b^2-4ac))/(2a)`

the result is as shown above.