If #x+2# is a factor of #f(x)=2x^3-3x^2-4x+a# , find the value of #a#?
2 Answers
Explanation:
Use the Synthetic division method;
Write down the coefficient numbers in the first row in order of highest to lowest power and the factor.
Drag the first coefficient number down,
We want the denominator to be zero, so
Feb 28, 2018
Explanation:
#"given "x+2" is a factor then "x=-2" is a zero"#
#rArrf(-2)=2(-2)^3-3(-2)^2-4(-2)+a=0#
#rArr-16-12+8+a=0#
#rArra=20#