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You would use the quadratic formula. x = -b +/- √b^2 - 4ac / 2a
x^2 - 4x - 21 = 0
a=1
b= -4
c= -21
Plug it into the quadratic equation and solve. :)
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Factor x squared - 4x - 21?
-17
How do you factor 4x squared - 16?
(2x + 4)(2x - 4) to check your answer, use the FOIL method (first, outside, inside, last) F.... 2x x 2x = 4x^2 0.... 2x x -4 = -8x I..... 2x x 4 = 8x L.... 4 x -4 = -16 so 4x^2 - 16 = (2x + 4)(2x - 4)
What is the answer to x cubed plus 4x squared minus 9x minus 36 divided by x plus 3?
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10
What is the integral of sin squared 2x?
You would probably use a power-reduction trig identity to solve this equation. This states that sin2(x) = (1 - cos(2x))/2 Therefore, sin2(2x) = (1 - cos(4x))/2, or (1/2)(1 - cos(4x)) So, ∫ (1/2)(1 - cos(4x)) dx = (1/2) ∫ (1 - cos(4x)) dx. Then, ∫ (1-cos4x)dx = x - (1/4)sin(4x) + c Now, multiply that by (1/2) to get: (x - (sin(4x)/4) + c)/2 Since c is an arbitrary constant, we have: ½(x - sin(4x) / 4) + c OR 1/8 * (4x - sin(4x)) + c
How do you factor x squared minus 4x minus 21?
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What is 4x squared times 4x squared?
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Factor x squared - 4x - 21?
-17
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x2 + 4x = x(x+4)
How do you factorise x squared plus 4x?
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What are the factors of 4x squared?
4x^2 = 2 * 2 * x * x
How do you solve for the problem x squared minus 10 equals 4x plus 11?
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What is the factor ofsixteen x squared-fortynine y squared?
(4x - 7y)(4x + 7y)
What is 2x squared plus 5x-4x squared plus x-x squared?
2x2 + (5x-4x)2 + (x-x)2 = 2x2 + x2 + 02 = 2x2 + x2 = 3x2
What does x squared - 4x factor out to?
x(x-4)
What is 4x squared plus x minus 2 in factored form?
x(4x-2)
4X squared +16 X?
20
