0
10x² - 9x + 2 = 10x² - 5x - 4x + 2 = 5x(2x - 1) - 2(2x - 1) = (5x - 2)(2x - 1). * (Note that -5 and -4 have a sum of -9; and that their product is +20, which is also the product of +10 and +2. That answers any question of how we knew to split the -9x into -5x and -4x, in the first step, above. This method will work whenever one factorises any factorisable quadratic expression; although I will not attempt here to explain the theory of why.) * The roots are 2/5 and ½. That is, 10x² - 9x + 2 = 0 exactly when, either, 5x - 2 = 0, or 2x - 1 = 0.
Still curious? Ask our experts.
Chat with our AI personalities
Judy
Devin
ViviAdd your answer:
Earn +20 pts
How can you take one from nine and get ten?
9 - (-1) = +10 positive nine minus negative one equals positive ten
Is a nanogram ten to the ninth power?
No, it's 10 to the minus nine
What is minus nine over ten divided by two times one over ten?
negative 9 over 2
What is negative ten subtract negative sixty?
-10-(-60)=50 A negative and a negative equals a positive. Therefore, negative ten minus negative sixty is the same as negative ten PLUS sixty. Sixty minus ten equals fifty.
What is the answer to negative ten minus negative two divided by two plus three?
negative 3
