Calculate $\frac { \mathrm { d } y } { \mathrm {~d} x }$

question 78

Multiple Choice

Calculate $\frac { \mathrm { d } y } { \mathrm {~d} x }$ . You need not expand your answer. $y = \left( \frac { x } { 1.2 } + \frac { 1.2 } { x } \right) \left( x ^ { 2 } + 7 \right)$

• A) \(2 x \left( \frac { 1 } { 1.2 } - \frac { 1.2 } { x ^ { 2 } } \right)\)
• B) \(\left( \frac { 1 } { 1.2 } - \frac { 1.2 } { x ^ { 2 } } \right) \left( x ^ { 2 } + 7 \right) - 2 x \left( \frac { x } { 1.2 } + \frac { 1.2 } { x } \right)\)
• C) \(2 x \left( \frac { 1 } { 1.2 } - \frac { 1.2 } { x ^ { 2 } } \right) + \left( \frac { x } { 1.2 } + \frac { 1.2 } { x } \right) \left( x ^ { 2 } + 7 \right)\)
• D) \(2 x\)
• E) \(\left( \frac { 1 } { 1.2 } - \frac { 1.2 } { x ^ { 2 } } \right) \left( x ^ { 2 } + 7 \right) + 2 x \left( \frac { x } { 1.2 } + \frac { 1.2 } { x } \right)\)

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