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Solve x(x-1)-12=0

Expand the brackets to find x²-x-12=0Factorise the equation to find (x-4)(x+3)=0Check it expands to equal x²-x-12=0Find the value of x as:x+4=0 therefore X=4x-3=0 therefore X=-3

Answered by Sarah W. • Maths tutor

2481 Views

Can you explain reflexive verbs and teach me how to conjugate them?

Of course!Reflexive verbs in Spanish are used when a person or thing is performing an action on itself.here is an example for each of the verb endings:lavarse - to wash oneselfverse - to see oneselfvestir...

Answered by Caylan G. • Spanish tutor

1377 Views

Find the gradient of the line x^2 + 3x - 6 at the point (5,34)

Differentiate: 2x + 3.Substitute for x=5: 2(5) + 3Answer =13.

Answered by Dan D. • Further Mathematics tutor

1540 Views

Factorise fully X^2 - 6X + 8

Factorising means reducing an equation to a set of brackets, in the form (x+a)(x+b), where a and b are constants. To factorise this equation, we must find two numbers that add to make -6, and multiply to ...

Answered by Dan D. • Maths tutor

2933 Views

Technetium is an element commonly used in medicine. A technetium atom is represented as ^99 _43 Tc. Give the number of protons, neutrons and electrons in this atom of technetium.

⁹⁹₄₃Tc (how it should be represented in question)
Number of protons = 43 Number of neutrons = 56 Number of electrons = 43
Technetium is given here in nuclear notation. This...

Answered by Daniel J. • Chemistry tutor

2688 Views