please tell fast tomorrow is my exam
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Given -1 is a root of the polynomial
so (x+1) is a factor of the polynomial.
Dividing the polynomial by x+1, we get x² + x - 12 as the quotient
x² + x - 12
= x² + 3x + 4x + 12
= x(x + 3) + 4(x + 3)
= (x+4)(x+3)
Hence x = -12 and x = -3
Hence the other 2 roots are -12 and -3.
Hope this helps! All the best for tomorrow's exam :-)
so (x+1) is a factor of the polynomial.
Dividing the polynomial by x+1, we get x² + x - 12 as the quotient
x² + x - 12
= x² + 3x + 4x + 12
= x(x + 3) + 4(x + 3)
= (x+4)(x+3)
Hence x = -12 and x = -3
Hence the other 2 roots are -12 and -3.
Hope this helps! All the best for tomorrow's exam :-)
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