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Let f(x) = 5x^4 + 6x^3 + 3, find dy/dx at x = 3

First we must differentiate the equation with respect to x. To differentiate you must multiply the coefficient (number in front) by the power of x, then subtract 1 from the power. So here we find dy/dx = (5 ...
FK
Answered by Francesca K. • Maths tutor
4018 Views

Rearrange the following making a the subject: (a+2)/5 = 3a+b

(a+2)/5 = 3a+b ...first, we need to multiply both sides by 5 a + 2 = 5 (3a + b) ....to be able substract 3a from the right side we need to remove the bracket. We multiply the bracket by 5. a + 2 = 15a + 5b ....
KR
Answered by Katerina R. • Maths tutor
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Expand the following: (4x+7)(7x-2)

Using the FOIL (Firsts, Outsides, Insides, Lasts) mnemonic, you can expand these two brackets. F: 4x x 7x = 28x^2 O: 4x x -2 = -8x I: 7 x 7x = 49x L: 7 x -2 = -14 Therefore the expansion as a whole is: 28x^2...
GP
Answered by Gem P. • Maths tutor
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Expand (x-5)(x+6)

expand the brackets X 2 + 6x - 5x - 30 2) collect like terms X 2 + x - 30
MP
Answered by Misha P. • Maths tutor
11817 Views

Differentiate y = x^3 + 2x^2 + 4x + 3

3 x 2 + 2x + 4
BB
Answered by Billy B. • Maths tutor
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