SOLUTION: Solve each quadratic equation.
23. x2 - 16 = 0
24. 2x2 - 3x - 11 = 0
25. x2 + 3x - 10 = 0
26. 3x2 + 48 = 0
27. x2 - 5x + 4 = 0
28. 2x2 - x + 1 = 0
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Question 177852: Solve each quadratic equation.
23. x2 - 16 = 0
24. 2x2 - 3x - 11 = 0
25. x2 + 3x - 10 = 0
26. 3x2 + 48 = 0
27. x2 - 5x + 4 = 0
28. 2x2 - x + 1 = 0
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
Solve each quadratic equation.
23. x^2 - 16 = 0
(x-4)(x+4) = 0
x = 4 or x = -4
-------------------------
24. 2x^2 - 3x - 11 = 0
x = [3 +- sqrt(9 -4*2*-11)]/4
x = [3 +- sqrt(97)]/4
-------------------------
25. x^2 + 3x - 10 = 0
(x+5)(x-2) = 0
x = -5 or x = 2
-------------------------
26. 3x^2 + 48 = 0
3(x^2 + 16) = 0
Factorable if you are familiar with complex numbers.
3(x+4i)(x-4i) = 0
x = -4i or x = 4i
-------------------------
27. x^2 - 5x + 4 = 0
(x-4)(x-1) = 0
x = 4 or x = 1
-------------------------
28. 2x^2 - x + 1 = 0
(2x+1)(x-1) = 0
x = -1/2 or x = 1
=========================
Cheers,
Stan H.
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