0000:00:00:00:00Start1Number 1ExplanationIf the tangent line to the curve y=x3−3x2−9xy = x^3 - 3x^2 - 9xy=x3−3x2−9x at point (a,b)(a, b)(a,b) has a gradient of 151515, then the possible value of a+ba + ba+b is....000−2-2−2−4-4−4−6-6−6−8-8−8
1Number 1ExplanationIf the tangent line to the curve y=x3−3x2−9xy = x^3 - 3x^2 - 9xy=x3−3x2−9x at point (a,b)(a, b)(a,b) has a gradient of 151515, then the possible value of a+ba + ba+b is....000−2-2−2−4-4−4−6-6−6−8-8−8
