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Solve the equation 3x squared + 4x – 12 = 0 Give your solutions correct to 2 decimal places.

3x 2 +4x-12=0 Step 1: formula (-b+/- square root (b 2 -4ac))/2a Step 2: a=3 b=4 c=-12 Step 3: type into your calculator Step 4: answer 1.44, or -2.77
JY
Answered by Jin Yang Q. • Maths tutor
17654 Views

How do you expand brackets?

The easiest method to expand brackets would be to remember FOIL! F - First O - Outside I - Inside L - Last Okay, so lets say you want to expand (3x+1)(2x+3), we'll fist multiply the f irst term of each brack...
CG
Answered by Connor G. • Maths tutor
5912 Views

What exactly IS differentiation?

This is a common question as we are often taught to differentiate by simply being told how to do the calculation, but not what it is we're really doing. The concept Differentiation is finding the gradient of...
JH
Answered by John H. • Maths tutor
8703 Views

There are 20 balls in a bag. The probability is 0.25 of picking a red ball. If one more red ball is added, what is the new probability of picking a red ball at random?

Convert 0.25 into a fraction where 20 is the denominator as there are 20 balls in total in the bag. 0.25 is the same as 1/4 and to convert this to 20 as the denominator multiply both the top and the bottom b...
AL
Answered by Alex L. • Maths tutor
12374 Views

The area of a square is 49cm^2. The perimeter of the square is equal to the circumference of a circle. what is the radius of the circle?

This is a geometry question. We know that a square has 4 equal sides of x, and that it's area is given by A=x 2 . So we can work out the length of the side of the square. x=sqrt(49) = 7 We are told this is e...
JC
Answered by Julia C. • Maths tutor
16300 Views