How do you find the zeros by rewriting the function #g(x)=3x^2+24x+21# in intercept form?
1 Answer
Dec 6, 2017
Explanation:
#"factorise g(x)"#
#g(x)=3(x^2+8x+7)larrcolor(blue)"common factor of 3"#
#"the factors of + 7 which sum to + 8 are + 1 and + 7"#
#rArrg(x)=3(x+1)(x+7)larrcolor(blue)"in intercept form"#
#"equate each of the factors to zero and solve for x"#
#x+1=0rArrx=-1#
#x+7=0rArrx=-7#
