⚠ (x+5)(x-5) is read as (x+5)*(x-5): use (...)*(...) for multiplication, use (...)^(...) for a power

Let's write in expanded form: $(x+5)·(x-5)$

ⓘ Expand by multiplying each term inside the parentheses: $(x+5)·(x-5)$ = $x·x$$+x·\left(-5\right)$$+5x$$+5·\left(-5\right)$

$x·x$$+x·\left(-5\right)$$+5x$$+5·\left(-5\right)$

ⓘ Multiplying powers with the same base adds the exponents: $x·x$ = $x^2$■The minus sign is placed in front of the product: $x·\left(-5\right)$ = $-5x$■Multiplications are done before additions and subtractions. A single minus sign does not cancel out, the product of a negative number by a positive number is negative: $5·\left(-5\right)$ = $-25$

$x^2$$-5x$$+5x$$-25$

ⓘ Like terms are grouped by adding their coefficients: $-5x+5x$ = $0$

$x^2+0-25$

ⓘ Adding 0 changes nothing: $0-25$ = $-25$

▶Expanded form:   $x^2-25$