The equation of tangent line to $y = 2x^2+7$, which is parallel to the line $4x-y+3 = 0$ is |
$4x-y+7=0$ $4x-y+3=0$ $4x-y+5=0$ $4x-y+1=0$ |
$4x-y+5=0$ |
The correct answer is Option (3) → $4x-y+5=0$ Given curve: $y = 2x^2 + 7$ Given line: $4x - y + 3 = 0 \Rightarrow y = 4x + 3$ Slope of given line: $m = 4$ Slope of tangent to curve: $\frac{dy}{dx} = 4x$ Set equal to 4: $4x = 4 \Rightarrow x = 1$ Corresponding $y$ on curve: $y = 2(1)^2 + 7 = 9$ Equation of tangent: $y - 9 = 4(x - 1) \Rightarrow y = 4x + 5$ |