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Expand and simplify (x − 4)(2x + 3y)^2

Answer: 4x³ + 12x²y + 9xy² - 16x² - 48xy - 36y²

Answered by Daisy H. • Maths tutor

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Solve y = 2x^2 - 5x - 1 for x = -1 and x = 2

y = 2 (-1)² -5(-1) -1y = 2 + 10 - 1y = 11y = 2 (2)² -5(2) -1y = 8 - 10 -1y = -3

Answered by Anna B. • Maths tutor

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Show that the lines y-5x=2 and 6y-30x=36 are parallel

Rearrange both equations so that both are in the form y= something. Move the x terms to the right of both equations. y=5x+2 6y=30x+36 Factorise second equation so that common factor of 6 is shown...

Answered by Madeleine B. • Maths tutor

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Expand: (x+3)(2x+4)

2x²+4x+6x+12=2x²+10x+12

Answered by Tristan K. • Maths tutor

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The perimeter of an isosceles triangle is 16cm the lengths of the sides are (x+3)(this is the length of the opposite side as well) and (x+4). Determine the value of x .

Write out all the information you have into one single equation, you know that the perimeter is the sum of the lengths of the sides of the triangle so write out the information as follows. x+3 + x+3...

Answered by Eve A. • Maths tutor

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