Card 1 of 21
How does the graph of f(x)=ax2+bx+cf(x)=ax^2+bx+cf(x)=ax2+bx+c open when a>0a>0a>0?
A
(x+5)2−18(x+5)^2-18(x+5)2−18
B
The general completed-square form is ax2+bx+c=ax^2+bx+c=ax2+bx+c= a(x+b2a)2+c−b24a\boxed{a\left(x+\frac{b}{2a}\right)^2+c-\frac{b^2}{4a}}a(x+2ab)2+c−4ab2.
C
The parabola opens upwards.
D
(x−6)2−16(x-6)^2-16(x−6)2−16
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1.1.5 Algebra and functions Flashcards
21 flashcards on CCEA A Level Maths 1.1.5 Algebra and functions: the key formulae, methods and definitions you need to recall for AS 1, AS 2, A2 1 and A2 2.