The operation of matrix unit I is the unit matrix of 2 * 2, a = 2453, C = a-7i, C =?

The operation of matrix unit I is the unit matrix of 2 * 2, a = 2453, C = a-7i, C =?

A= 2 4
5 3
I= 1 0
0 1
A-7I
= (2 4) - (7 0)
(5 3) (0 7)
= (-5 4)
(5 -4)
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Matrix operation formula complete, quick solution

How to draw parabola for the image of special quadratic function y = - 2x square
How can I get some?

Y=-2X²=-2(x-0)²+0
So the vertex of function image is (0,0) symmetry axis X = 0 = y axis
Opening down
If you take some, you can do that
x -2 -1 0 1 2
y -8 -2 0 -2 -8

30 = 3 × 2x5,36 = 2x2x3 × 3,30 and 36 share the same prime factor () and their unique prime factors are（
30 = 3 × 2x5,36 = 2x2x3 × 3,30 and 36 share the same prime factor () and their unique prime factor is ()

(3 and 2) (5)

Mathematical amount (1) known a + B = 5, a ^ 2 + B ^ 2 = 13, find the value of AB (2) known A-B = 7, ab = 18, find the value of (a + b) ^ 2
Thanks for the process

According to the definition of derivative, it is proved that: (INX) '= 1 / X

lim（ln(x+h)-lnx）/h=lim(ln(1+h/x)^(1/h))=lim(ln(e)^(1/x))=1/x

What is the least common multiple of 19 and 17

They are reciprocal

Is the reciprocal of the absolute value of minus one and four fifths nine fifths~

No!
-(1 + 4 / 5) = - 9 / 5, the absolute value is 9 / 5
The reciprocal of 5 / 9 is five out of nine, not nine out of five

The square reduction of the sum of X and Y

(x+y)²
=x(x+y)+y(x+y)
=x²+xy+xy+y²
=x²+2xy+y²

Simple calculation 4.9-4.9 × 0.9
Hand it in tomorrow

Original formula = 4.9 * (1-0.9) = 4.9 * 0.1 = 0.49 Extraction of common factor method,